The area of a playground is 320 yards squared. The width of the playground is 4 yards longer than its length. Find the perimeter
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The volume for a pyramid is 
, where B is the area of the base and h is the height. We are given the volume, and the base and height in terms of x. Our formula then looks like this: 
. Simplifying the right side we have 
. Multiply both sides by 18 to get rid of the fraction and we have 
, so x = 117.575